Add CI job to build on Solaris

Signed-off-by: Björn Svensson <bjorn.a.svensson@est.tech>

Author: bjosv

.github/workflows/build.yml

@@ -74,6 +74,17 @@ jobs:
             gmake
             mkdir build && cd build && cmake .. && gmake
 
+  solaris:
+    runs-on: ubuntu-latest
+    name:  Solaris
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - name: Build in Solaris
+        uses: vmactions/solaris-vm@58cbd70c6e051860f9b8f65908cc582938fbbdba # v1.1.5
+        with:
+          prepare: pkgutil -y -i gmake openssl_utils
+          run: USE_TLS=1 gmake
+
   build-cross:
     name: Cross-compile ${{ matrix.config.target }}
     runs-on: ubuntu-22.04